If you don’t know his past work (“Modern Family”), you’re going to know him soon — as a star of Denis Leary’s upcoming USA show “Sirens.” A Julliard-trained actor, Kevin Daniels has been popping up in everything you watch for years, from Broadway to “Buffy the Vampire Slayer” to The Island. The big-hearted lug tells us all about his crazy adventures taking over your T.V. one show at a time.